Hello guys, I just need help with these two questions.

Which function is shown in the graph?

f(x)=1/2sinx

f(x)=−1/2cosx

f(x)=−1/2sinx

f(x)=1/2cosx

Which equation represents the function of the graph?

f(x)=cos1/2x

f(x)=sin2x

f(x)=sin1/2x

f(x)=cos2x

Guest Feb 1, 2018

#1**+1 **

1st one :

This is the graph of the cosine reflected across the x axis....and with an amplitude of 1/2

So......the correct answer is :

f(x) = -(1/2)cos (x)

2nd one :

This is the sine graph with a period half as long as normal.....thus....there are 2 periods in 2pi

So....the correct answer is

f(x) = sin (2x)

CPhill Feb 1, 2018